Rancho Cucamonga caps residential-property-line noise at 65 dBA daytime and 60 dBA overnight under Development Code Section 17.66.050, and cuts each limit by 5 dBA for continuous simple-tone equipment like data-center chillers and generators.
Development Code Section 17.66.050 sets exterior noise limits at the residential property line: 65 dBA from 7:00 a.m. to 10:00 p.m. and 60 dBA from 10:00 p.m. to 7:00 a.m. When a noise source is continuous and consists of simple-tone or impulse noise-which describes data-center cooling and backup generators-each limit drops 5 dBA, to 60 dBA day and 55 dBA overnight. Commercial and office uses face a 70/65 dBA limit. Industrial performance standards in Table 17.66.110-1 add lot-line caps of 70 to 85 dBA by class, but 65 dBA at any residential property line. The overnight simple-tone floor binds where industrial land meets homes.
Noise over the Section 17.66.050 limits is a Development Code violation; the planning director may require the ambient level to be established, and enforcement runs through citations, permit conditions, and abatement.
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Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle data center noise limits.
See how Rancho Cucamonga's data center noise limits rules stack up against other locations.
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